Drop in Aegis Angel or Avacyn, Angel of Hope to protect Kaalia, or get Rune-Scarred Demon or Burning-Rune Demon to grab Liliana's Contract and finish the game
Its not guaranteed to trigger, and I think there are better things we can be doing with four mana
certainly shines the most is against opposing decks with lots of tokens
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For example, when Play Boosters premier, The List will include what we call Special Guests , 10 cards that are exciting reprints that we can give new art and will thematically tie into whatever set they are in
It even goes further with a delirium ability (which checks whether there are at least four different card types in your graveyard) which will provide another tap down at the beginning of each opponent's upkeep